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- /*
- ==============================================================================
-
- This file is part of the JUCE library.
- Copyright (c) 2013 - Raw Material Software Ltd.
-
- Permission is granted to use this software under the terms of either:
- a) the GPL v2 (or any later version)
- b) the Affero GPL v3
-
- Details of these licenses can be found at: www.gnu.org/licenses
-
- JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
- A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
- ------------------------------------------------------------------------------
-
- To release a closed-source product which uses JUCE, commercial licenses are
- available: visit www.juce.com for more information.
-
- ==============================================================================
- */
-
- Value::ValueSource::ValueSource()
- {
- }
-
- Value::ValueSource::~ValueSource()
- {
- cancelPendingUpdate();
- }
-
- void Value::ValueSource::handleAsyncUpdate()
- {
- sendChangeMessage (true);
- }
-
- void Value::ValueSource::sendChangeMessage (const bool synchronous)
- {
- const int numListeners = valuesWithListeners.size();
-
- if (numListeners > 0)
- {
- if (synchronous)
- {
- const ReferenceCountedObjectPtr<ValueSource> localRef (this);
-
- cancelPendingUpdate();
-
- for (int i = numListeners; --i >= 0;)
- if (Value* const v = valuesWithListeners[i])
- v->callListeners();
- }
- else
- {
- triggerAsyncUpdate();
- }
- }
- }
-
- //==============================================================================
- class SimpleValueSource : public Value::ValueSource
- {
- public:
- SimpleValueSource()
- {
- }
-
- SimpleValueSource (const var& initialValue)
- : value (initialValue)
- {
- }
-
- var getValue() const
- {
- return value;
- }
-
- void setValue (const var& newValue)
- {
- if (! newValue.equalsWithSameType (value))
- {
- value = newValue;
- sendChangeMessage (false);
- }
- }
-
- private:
- var value;
-
- JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SimpleValueSource)
- };
-
-
- //==============================================================================
- Value::Value() : value (new SimpleValueSource())
- {
- }
-
- Value::Value (ValueSource* const v) : value (v)
- {
- jassert (v != nullptr);
- }
-
- Value::Value (const var& initialValue) : value (new SimpleValueSource (initialValue))
- {
- }
-
- Value::Value (const Value& other) : value (other.value)
- {
- }
-
- Value& Value::operator= (const Value& other)
- {
- value = other.value;
- return *this;
- }
-
- #if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS
- Value::Value (Value&& other) noexcept
- {
- // moving a Value with listeners will lose those listeners, which
- // probably isn't what you wanted to happen!
- jassert (other.listeners.size() == 0);
-
- other.removeFromListenerList();
- value = static_cast<ReferenceCountedObjectPtr<ValueSource>&&> (other.value);
- }
-
- Value& Value::operator= (Value&& other) noexcept
- {
- // moving a Value with listeners will lose those listeners, which
- // probably isn't what you wanted to happen!
- jassert (other.listeners.size() == 0);
-
- other.removeFromListenerList();
- value = static_cast<ReferenceCountedObjectPtr<ValueSource>&&> (other.value);
- return *this;
- }
- #endif
-
- Value::~Value()
- {
- removeFromListenerList();
- }
-
- void Value::removeFromListenerList()
- {
- if (listeners.size() > 0 && value != nullptr) // may be nullptr after a move operation
- value->valuesWithListeners.removeValue (this);
- }
-
- //==============================================================================
- var Value::getValue() const
- {
- return value->getValue();
- }
-
- Value::operator var() const
- {
- return value->getValue();
- }
-
- void Value::setValue (const var& newValue)
- {
- value->setValue (newValue);
- }
-
- String Value::toString() const
- {
- return value->getValue().toString();
- }
-
- Value& Value::operator= (const var& newValue)
- {
- value->setValue (newValue);
- return *this;
- }
-
- void Value::referTo (const Value& valueToReferTo)
- {
- if (valueToReferTo.value != value)
- {
- if (listeners.size() > 0)
- {
- value->valuesWithListeners.removeValue (this);
- valueToReferTo.value->valuesWithListeners.add (this);
- }
-
- value = valueToReferTo.value;
- callListeners();
- }
- }
-
- bool Value::refersToSameSourceAs (const Value& other) const
- {
- return value == other.value;
- }
-
- bool Value::operator== (const Value& other) const
- {
- return value == other.value || value->getValue() == other.getValue();
- }
-
- bool Value::operator!= (const Value& other) const
- {
- return value != other.value && value->getValue() != other.getValue();
- }
-
- //==============================================================================
- void Value::addListener (ValueListener* const listener)
- {
- if (listener != nullptr)
- {
- if (listeners.size() == 0)
- value->valuesWithListeners.add (this);
-
- listeners.add (listener);
- }
- }
-
- void Value::removeListener (ValueListener* const listener)
- {
- listeners.remove (listener);
-
- if (listeners.size() == 0)
- value->valuesWithListeners.removeValue (this);
- }
-
- void Value::callListeners()
- {
- if (listeners.size() > 0)
- {
- Value v (*this); // (create a copy in case this gets deleted by a callback)
- listeners.call (&ValueListener::valueChanged, v);
- }
- }
-
- OutputStream& JUCE_CALLTYPE operator<< (OutputStream& stream, const Value& value)
- {
- return stream << value.toString();
- }
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